Improvement in rotary steam-generators



UNITED STATES NATHANIEL T. EDSON, OF NEW ORLEANS, LOUISIANA.

IMPRovEMENT IN ROTARY STEAM-GENERA-T0RS.

Specification forming part of Letters Patent No. 116,283, dated June 27, 1871.V

A heads being also'l connected witheach other by stra-ight tubes exterior to the main cylinder; and it consists in providing, in addition to such straight tubes, a series of spiral tubes, also connecting the hollow heads of the boiler, byf-.means of whicha stronger circulation will be induced in the boiler as it is revolved, the spiral form ofthe tubes also admitting of their expansion and contraction without causing a leak at their ends. The second part of my invention relates to and consists in connecting the steam and water pipesthat pass through the trunnion or hollow journals of revolving boilers so as to take the outward pressure oit' from the steam an d water pipes and reduce the pressure against the heads ofthe boiler. The third part of my invention relates to revolving boilers with pipes passing through each of their trunnions; and it consists in forming an elongated opening in the water-pipe, through which the blow-oft' and water-gauge pipes are made to pass, and thereby partially revolved, by means of which the height of waterin the boiler can be ascertained.

Figure 1 is a transverse section of a steamgenerator embodying my invention. Fig. 2 is a longitudinal section of the slime.

A A are the ends ot the furnace. In each are circular openings, through which the trunnions H H pass. D is the furnace-mouth. The opening E is for the exit of smoke.v B is the bridgewall, by which the heat and llame are caused to impinge upon the entire structure in their passage around the cylinder F and among the tubes I and K. The bars C (l, Snc., extend from end to end of the furnace. Their inner'edges are provided with projections or anges for the reception of fire-tile. rIhe tile are heldin their places by a sheet-iron casing, a. G Gr are the tubevbracing the whole structure.

then rmly attached to one of the trunnions, and

sheets, the inner `lian ges of which are riveted to the cylinder F and the outer fla-n ges to the he ds. The outer circles of tubes are straight and ar set parallel with the cylinder, their ends being` rmly attached to the tube-sheet, thus bracing and greatly increasing the strength of the generator. K K, 85e., the inner circles of tubes, are spiral, extending nearly half round the cylinder. ends enter the tube-sheetsand are fastened in the usual manner. M-is the steam-pipe, with a branch extending upward in one ofthe enlarged ends of the generator, from whence the steam is taken to the engine. a branch, O, through which is supplied the generator. P is a pipe to which the blow-oit' cock and water-gauge are connected. The inner end is bent downward and terminates in the generator about or a little below the point at which water should be kept, so that whenever the water gets below that point steam will rush out instead ot' water, as would be the case if the regular supply were kept up. 'Ilhis pipe can be turned by its handle so as to shuow vthe height ot' water. L is a pipe, its ends iirmly screwed to M and N. rIlhe end connected with N is open so as to use the interior of it for steam. An elongated opening is made in N for the supply of water to the generator and to admit the turning of the pipe P.

In putting together my boiler, pipe M is rst placed in the generator; pipe L is then screwedl into pipe M 5 pipe N is then screwed onto L, after which the trunnions H H are attached to the heads ofthe genera-tor by screw-bolts. The furnace ends A A are then placed on the trunnions, and the bars C C, &c., are then placed in position and screwed firmly to `the furnace ends, The cog-wheel is by it the generator is revolved slowly over the tire, it being necessary always to have sufficient water in the generator to cover the lower part of the cylinder F.

Having thus described my invention, I do not confine myself to a combination ot' the spiral tubes with the straight tubes, as with large trunnions and large openings through them a sufii- `cient pressure will be taken oft vtheir heads by pipe L to dispense with the straight tubes. Nei- Their N is the water-pipe, with ther do I confine myself to the use of a pipe for 2. The pipe P, in combination with the elonoouneoting the. water and steam pipes that pass gated opening formed in lipo N, and with the through the trunnious, as a solid bar or rod of pipe L or its equivalent, substantially as and for iron may be substituted therefor. the purpose hereiubeforeset forth.

I ola-im as my invention- NATHL. T. EDSON. l. The spiral tubes K connecting the hollor Witnesses:

boiler-heads, substantially as and for the pur- WM. MCG. JONES,

poses hereubefore set forth. J. S. TOOLEY. 

